SmogRank / History / City race
Cities in Brazil, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Brazil for PM2.5 over the 30 days to 16 Dec 2025: Anchieta 30.5 µg/m³, Guarapari 27.9 µg/m³ and São Luís 18.2 µg/m³.
- 1AnchietaEspírito Santo30.5
- 2GuarapariEspírito Santo27.9
- 3São LuísMaranhão18.2
- 4Nova UniãoMinas Gerais13.2
- 5JundiaíSão Paulo13.1
- 6Santo AndréSão Paulo12.8
- 7AraucáriaParaná12.6
- 8TubarãoSanta Catarina12.5
- 9Ferraz de VasconcelosSão Paulo12.2
- 10Coronel FabricianoMinas Gerais12.0
- 11BetimMinas Gerais12.0
- 12IbiritéMinas Gerais11.9
- 13TimóteoMinas Gerais11.8
- 14Rio ClaroSão Paulo11.6
- 15GuarapuavaParaná11.4
- 16São PauloSão Paulo11.2
- 17CampinasSão Paulo11.2
- 18ItaquaquecetubaSão Paulo10.5
- 19PaulíniaSão Paulo10.1
- 20SantosSão Paulo10.0
+ 20 more cities, the next at 9.5 µg/m³
Not counted on this day, too few days measured: Ponta Grossa since 16 Dec 2025, Maringá since 11 Dec 2025, Bauru since 4 Dec 2025 and 6 more cities.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.